Heating apparatus



Feb. 18, 1941. J. VLADU 2,231,975

HEATING APPARATUS Filed, Feb. 11, 1939 a &

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Inwcntor Jol /v VA H041.

Gttorucus Patented Feb. 18, 1941 PATENT OFFICE 2,231,975 HEATING APPARATUS John Vladu,

Detroit, Mich.

Application February 11, 1939, Serial No. 255,809

3 Claims.

This invention relates generally to heating apparatus and more particularly to a flue or stack control.

One of the objects of the invention is to pro- 6 vide a new and improved heating apparatus which will be eflicient and inexpensive to operate.

Another object of the invention is to provide a new and improved control for decreasing the heat loss through the stack or flueto economize on fuel.

A further object of the invention is to provide a stack or flue control which is inexpensive to operate and to manufacture.

Other objects of the invention will be apparent from the following detailed description taken in connection with the accompanying drawing in which Figure 1 is a view of a heating bodying my invention;

' Fig. 2 is a view in elevation of my improved flue control, and

Fig. 3 is a view in section of the flue control.

Referring to the drawing by characters of reference, the numeral I designates in general a furnace which may be of any type but which, in the present instance, is a steam furnace having the usual fire door 2 and draft damper 3. The draft damper 3 is operated by the well known draft check mounted on the top of the furnace I which check is operable in response to the temperature of the furnace or to the steam pressure. The check comprises, in general, a lever 4 pivoted at 5 and a weight 6 adjustable on the lever to regulate the operation of the I damper, the damper being connected to the lever 4 preferably by a suitable cord 1.

Leading from the furnace I there is the usual flue or stack 8 for carrying away the products of combustion and interposed in the stack 8 is my improved control I0 which is also operated in accordance with the temperature or the steam pressure of the furnace l-.

The control I0 includes a duct II which may be rectangular in shape having a front wall l2 provided with an inlet I3 and having a rear wall l4 provided with an outlet I5. The inlet I3 is preferably located adjacent the bottom of the duct II and the outlet I is preferably located adjacent the top of the duct, overlying substantially one-half of the area of the inlet, as shown.

In the front wall I2, above the inlet I3, is provided a plurality of inlets It for the entrance of air into the duct and the flow capacity of these inlets I6 and also the flow capacity of the inlet apparatus em- I3 is controlled by a vertically movable damper I! which is connected to the arm 4 preferably by a cord I8 guided on pulleys I9, one end of the cord I8 being secured to an upwardly extending strap, Ila which may be integral with the damper l1. may be guided in oppositely disposed channel members 20 which may be welded or otherwise suitably secured to and within the duct II. Preferably the bottom wall of the duct I I is a slidable panel, indicated at 2i, whereby, if desired, additional air may be taken into the flue.

It will be seen that the outlet I5 of the duct I I overlies a portion of the air inlets l6 as Well as overlying a portion of the flue inlet I3.

Operation In the operation of the heating apparatus, when the arm 4 operates to-open the furnace damper 3, it will be seen that the flue damper I1 is moved gradually toward open position whereby to increase the flow capacity of the inlet I3. The control lever 4 and the cord I8 connecting the lever to the damper I! may be adjusted so that the damper I! will open the inlet I3 to full capacity or to less than full capacity as desired, and this adjustment of course will be different for different types of heating apparatus. Also,

the arrangement for oil and gas furnaces may be such that the damper H on closing of the draft damper 3 will completely close the inlet I3. When the damper I1 is lowered to decrease the area of the inlet I3 the damper also opens or increases the flow capacity or area of the air inlets I6 with the result the air from the basement is drawn up the stack and chimney, thereby decreasing heat loss from the furnace through the chimney. Or in other words, since suction will not be effective entirely on the inlet I3 but instead will be partly effective upon and draw air into the flue through the air inlet IE, it will be seen that heat loss from the furnace through the chimney will be materially decreased. The lever 4 will, of course, operate to close the damper 3 and when this occurs the flue damper I! will be raised to decrease gradually the capacity of the flue to give proper draft for combustion, and thus prevent the fire from becoming overheated. It will be understood that in fuel stoked furnaces as distinguished from burner types, operation of the stack damper will be gradually but in burner type furnaces the stack damper may be operated quickly in accordance with operation of a burner control.

From the following description it will be seen that I have provided a new and improved heating The damper I1 may be freely slidable and decrease the heat loss through the stack is operable in accordance with the operation of the furnace draft damper in a manner such that escape of heat through the flue is decreased when the furnace draft damper is closed. In addition, it will be seen that my stack control is simple in construction and inexpensive to manufacture and that any danger of the fire going out or of a back pressure occurring is overcome by reason of the controlled air inlets l6 through which air is drawn when the flue damper is in position to decrease the flue capacity at the flue control.

What I claim is: I h

1. A damper control unit for insertion in a heating apparatus comprising, a casing having a pair of spaced upright walls, a plurality of elongated vertically spaced air inlets in one of said walls, a single inlet in said one wall for the products of combustion, a pair of vertically extending slideways in said casing adjacent said one wall, a damper guided in said slideways and controlling said plurality of inlets and also for controlling said single inlet, and an outlet in said other wall for discharge of the products of combustion and air taken in through said plurality of inlets, said outlet being arranged in staggered relation .to

the flow capacity of one of said inlets and correspondingly increasing the capacity of the other of said'inlets, an outlet in the other of said walls and ofiset from but partly overlying said inlets to effect a bafliing of flow through said casing.

3. A flue control for a heating apparatus comprising, a casing having a pair of spaced upright walls, an air inlet in one of said walls and open directly to outside atmosphere, a secondinlet in said one wall for entrance of the products of combustion into said casing from a furnace, slideways in said casing adjacent said one wall, a damper guided in said slideways and controlling said inlets, said damper on movement decreasing the flow capacity of one of said inlets and correspondingly increasing the capacity of the other of said -inlets, and an outlet in the other of said walls.

J OHN VLADU. 

